Foldable chairs

ABSTRACT

A foldable chair has front and rear legs are interactive by using pivotal units. After expansion, top ends of the rear leg are positioned to the rear lower end of the handles of a back cushion. It is stable and safe. After the chair is closed, the front leg is alternative arranged with the rear leg. After a plurality of chairs are closed and overlapped together, the volume for storing the chairs are greatly reduced and the overall height is reduced. In close state, the legs of the chairs are alternatively arranged with a stable and safe structure. In overlapping of a plurality of chairs, ground retainers of the chairs have the function of slide-proof so that a plurality of chairs can be overlapped stably. As a plurality of chairs are overlapped for storage, they will generate a horizontal resisting force so that the chairs are overlapped stably and safely.

FIELD OF THE INVENTION

The present invention relates to chairs, and in particular to foldable chairs which can be overlapped with less spaces and slide proof design is contained in the chairs.

BACKGROUND OF THE INVENTION

Foldable chairs are generally used in a large space (such as in school, or a gymnasium, a conference hall, etc.). Therefore, as the chairs are not used, the chairs can be folded for storage.

Generally, the foldable chairs are made of different materials, such as woods, or metals. The wood foldable chair is not concrete. Furthermore, currently, it is difficult to get wood for making chairs. Therefore, most of foldable chairs are made of metals which are concrete and endurable. Further, the comfortability and volume for storage are not main concerns. However, with the improvement of human life, less space can be used for storing chairs. Problems about confortablilty, outlooks, styles, and storage spaces are concerned and improved in current making of foldable chairs so as to have the effects of comfortness, safety, non-falling down of the seat cushion, and less space for overlapping of a plurality of chairs. However, in all these improvements, as a plurality of chairs are overlapped, the thickness of these chairs will be greater or equal to the summation of the individual chairs. Furthermore, as a plurality of chairs are overlapped, no slide-proof structure is designed.

Therefore, there is an eager demand for a novel design which can improve the prior art defects.

SUMMARY OF THE PRESENT INVENTION

Accordingly, the primary object of the present invention is to provide a foldable chairs, which can be overlapped with less spaces and slide proof design is contained in the chairs.

To achieve above object, the present invention provides a foldable chairs having front and rear legs are interactive by using pivotal units. After expansion, top ends of the rear leg are positioned to the rear lower end of the handles of a back cushion. It is stable and safe. After the chair is closed, the front leg is alternative arranged with the rear leg. After a plurality of chairs are closed together, the volume for storing the chairs are greatly reduced and the overall height for storing a chair is reduced. In close state, the legs of the chairs are alternatively arranged with a stable and safe structure. In overlapping of a plurality of chairs, ground retainers of the chairs have the function of slide-proof so that a plurality of chairs can be overlapped stably. As a plurality of chairs are overlapped for storage, they will generate a horizontal resisting force so that the chairs are overlapped stably and safely.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross section view of the present invention.

FIG. 2 is a schematic view showing the opening and closing operation of the present invention.

FIG. 3 is a front view of the back cushion of the present invention.

FIG. 4 is a right side view of FIG. 3,

FIG. 5 is a cross sectional view viewed from line 5-5 of FIG. 3,

FIG. 6 is a cross sectional view viewed from line 6-6 of FIG. 3.

FIG. 7 is an elevational view of the seat cushion of the present invention.

FIG. 8 is a left side view of FIG. 7.

FIG. 9 is a right side view of FIG. 7.

FIG. 10 shows the right pivotal unit of the present invention.

FIG. 11 is a right side view of FIG. 10.

FIG. 12 is a left side view of FIG. 10.

FIG. 13 is a rear view of FIG. 10.

FIG. 14 shows the left pivotal unit of the present invention.

FIG. 15 is a right side view of FIG. 14.

FIG. 16 is a left side view of FIG. 14.

FIG. 17 is a rear view of FIG. 14.

FIG. 18 is a schematic view showing that a plurality of chairs are overlapped.

DETAILED DESCRIPTION OF THE INVENTION

In order that those skilled in the art can further understand the present invention, a description will be provided in the following in details. However, these descriptions and the appended drawings are only used to cause those skilled in the art to understand the objects, features, and characteristics of the present invention, but not to be used to confine the scope and spirit of the present invention defined in the appended claims.

With reference to FIGS. 1 to 18, the structure of the present invention will be described herein.

A back cushion 2 has a cambered surface which is suitable to resist against a back of a person. Referring to FIGS. 3 to 6, each of two sides of the back cushion 2 has a handle 22. A lower side of the handle 22 has a positioning portion 23 which is bent backwards so as to form with an acute angle so that a plurality of back cushions 2 can be overlapped one by one as illustrated in FIG. 18. A front lower end of each handle 22 has a hollow cylinder 20. The front end of the handle 22 is further formed with an open space for installing the rear leg 4.

A seat cushion 5 is illustrated in FIGS. 7 to 9. A middle section of each of two lateral sides of the seat cushion 5 has a pivotal hole 51. A rear end of each of the two lateral sides of the seat cushion 5 is formed with a pivotal seat 52 (which is of, for example, elliptical shape).

As illustrated in FIGS. 10 to 17, two pivotal units 3 are included. Each pivotal unit 3 has two pivotal holes 31, 32 which are not arranged in the same plane. The pivotal hole 31 of the pivotal unit 3 is at a front end thereof and the pivotal hole 32 of the pivotal unit 3 is at a rear end thereof. The pivotal units 3 are retained at two outer sides of the front leg 1 by using screws (not shown) can passing through pivotal holes 31 so that the pivotal units 3 can pivotally rotate around the pivotal holes 31.

A front leg 1 has a U shape structure with two extending rods. Two distal ends of the front leg 1 are inserted into the hollow cylinders 20 of the back cushion 2 by screwing operation. A lower end of the front leg 1 is installed with at least two ground retainers 11 for reducing the friction between the front leg 1 and ground. A back side of each ground retainer 11 is installed with a positioning unit 12 (see FIGS. 1 and 2). A middle section of each side rod of the front leg 1 is pivotally connected to a respective pivotal hole 51 of the seat cushion 5 at a respective lateral side of the seat cushion 51 so that the seat cushion 5 can pivotally rotate around the pivotal hole 51 of the seat cushion 5.

A rear leg 4 has a U shape. Each of the two distal ends of the rear leg 4 is pivotal to the pivotal holes 32 of the pivotal unit 3 by screwing through the pivotal hole 32 of the pivotal unit 3. A gap between two distal ends of the U shape rear leg 4 is larger than that of the U shape front leg 1. A middle section of each lateral side of the rear leg 4 is pivoted to the pivotal seat 52 of the seat cushion 5. A lower end of the rear leg 4 is installed with at least two ground retainers 41 for reducing the friction between the rear leg 4 and ground. A back side of each ground retainer 41 is installed with a positioning unit 42 (see FIG. 1). The pivotal seat 52 at the rear side of the seat cushion 5 is pivotally connected to a middle section of the rear leg 4 so that the rear end of the seat cushion 5 can pivotally rotate around the pivotal seat 52 thereof.

Referring to FIGS. 1, 2, and 18, in expansion of the chair of the present invention, the front and rear legs are interactive by the pivotal units 3. After expansion, top ends of the rear leg 4 are positioned to the rear lower end of the handles. It is stable and safe. After the chair is closed, the front leg 1 is alternative arranged with the rear leg 4 (see FIG. 18). After a plurality of chairs are closed together, the volume for storing the chairs are greatly reduced and the overall height for storing a chair is reduced. In close state, the legs of the chairs are alternatively arranged with a stable and safe structure. In overlapping of a plurality of chairs, the ground retainers of the chairs have the function of slide-proof so that a plurality of chairs can be overlapped stably. As a plurality of chairs are overlapped for storage, they will generate a horizontal resisting force so that the chairs are overlapped stably and safely.

The present invention is thus described, it will be obvious that the same may be varied in many ways. For example, the slot 11, 12 can be formed directly to the pillar; the pushing head 46 of the tightening unit 4 can be formed like a saddle capable of sitting across the water blocking sheet for better stability. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims. 

What is claimed is:
 1. A foldable chair, comprising: a back cushion having a cambered surface; each of two sides of the back cushion having a handle; a lower side of the handle having a positioning portion which is bent backwards so as to form with an acute angle so that a plurality of back cushions can be overlapped one by one; a front lower end of each handle having a hollow cylinder; the front end of the handle being further formed with an open space; a seat cushion; a middle section of each of two lateral sides of the seat cushion having a pivotal hole; a rear end of each of the two lateral sides of the seat cushion being formed with a pivotal seat; a front leg having a U shape structure with two extending rods; two distal ends of the front leg being inserted into the hollow cylinders of the back cushion by screwing operation; a middle section of each side rod of the front leg being pivotally connected to a respective pivotal hole of the seat cushion at a respective lateral side of the seat cushion so that the seat cushion can pivotally rotate around the pivotal hole of the seat cushion; two pivotal units; each pivotal unit having two pivotal holes, a front pivotal hole and a rear pivotal hole, which are not arranged in the same plane; the pivotal units being retained at two outer sides of the front leg by using screws to pass through the front pivotal holes so that the pivotal units can pivotally rotate around the front pivotal holes; a rear leg having a U shape; each of the two distal ends of the rear leg being pivotal to the pivotal holes of the pivotal unit by screwing through the pivotal hole of the pivotal unit; a gap between two distal ends of the U shape rear leg being larger than that of the U shape front leg; a middle section of each lateral side of the rear leg being pivoted to the pivotal seat of the seat cushion; the pivotal seat at the rear side of the seat cushion being pivotally connected to a middle section of the rear leg so that the rear end of the seat cushion can pivotally rotate around the pivotal seat thereof.
 2. The foldable chair as claimed in claim 1, wherein a lower end of the front leg being installed with at least two ground retainers for reducing the friction between the front leg 1 and ground; a back side of each ground retainer being installed with a positioning unit.
 3. The foldable chair as claimed in claim 1, wherein a lower end of the rear leg being installed with at least two ground retainers for reducing the friction between the rear leg and ground; a back side of each ground retainer being installed with a positioning unit. 